'Fascinating', 'brilliant', 'oddly moving', 'a warm human picture' - this biography was enthusiastically received when it came out in 1957. And no wonder. It is not only the lively story of a distinguished man but a lucid account of his work and its significance. The author, who was himself a philosopher and journalist, has followed the bright thread of Russell's personality with affectionate insight, from the three-day-old baby who looked about him 'in a very energetic way', and the boy who jibbed at taking Euclid on trust, through the many turns of his life, to the undimmed octogenarian, still questioning and still deeply concerned. The subject is a great one and the biographer has matched it.